im looking to clean the small bolts on the split rim 108 style, mine have gone black and have started to drip/run smear the the silver star centre peice
Wheel cleaner, and an old toothbrush. Hold it with your thumb on the back, bristles facing down, and brush the bolts back and forth from the outside of the wheel towards the inside, so at right angles to the wheel if that makes sense. The bristles get nicely into the centre of the bolt and down the sides.
My neighbours think I am a nutter, especially when I blow in each bolt to get the water out when drying the wheels